represents a channel receiver function that applies fun to any channel message it receives.


ChannelReceiverFunction
represents a channel receiver function that applies fun to any channel message it receives.
Details and Options

- CloudDeploy[ChannelReceiverFunction[…]] yields a CloudObject containing meta-information that specifies the channel to which messages for the channel receiver should be sent.
- CloudDeploy[ChannelReceiverFunction[…]"curi"] deploys the receiver to ChannelObject["curi"].
- CloudDeploy[ChannelReceiverFunction[…]channel] deploys the receiver to the specified channel, given as ChannelObject[…].
- CloudDeploy[ChannelReceiverFunction[…]] is equivalent to CloudDeploy[ChannelReceiverFunction[…]Automatic].
- In a deployed ChannelReceiverFunction[fun], fun[assoc] is evaluated whenever a channel message is received. The association assoc contains the same elements as in ChannelListen, except for ones specific to the ChannelListener object.
- CloudDeploy[ChannelReceiverFunction[fun]] sets up a channel receiver function that is executed in the cloud and does not require active listeners in any specific Wolfram Language session.
- The function fun is evaluated in the environment of the owner of the channel receiver function.
- Channel receiver functions cannot be triggered by messages that were themselves sent from within channel receiver functions.
Examples
open all close allBasic Examples (3)
Apply the function to an association representing a channel broker message:
Define a receiver function that logs the incoming message to a cloud object:
Obtain the target channel of the receiver:
Send a message to the channel:
Define a receiver function that logs the incoming message to a databin:
Obtain the target channel of the receiver function:
Send a message to the channel:
Check the contents of the databin:
Timestamps are treated specially by the Wolfram Data Drop and are available in a separate property (or together with the entry body in the “FullEntries” property):
Scope (7)
Applications (3)
Deploy a channel that adds incoming messages to a databin:
Send a message to the channel and retrieve its content from the databin:
Define a receiver function that sends messages containing the string "URGENT" to a priority channel and the rest to a bulk channel:
Create the two channels and deploy the receiver function to a third channel, which is automatically created:
Start listening on the channels:
Send a regular and an urgent message on the dispatcher channel:
Deploy a receiver function that sends an email alert if a message arrives when nobody is listening on the channel:
Send a message on the channel and check your mailbox for an email alert:
Properties & Relations (1)
Deploying ChannelReceiverFunction sets ChannelBrokerAction for the associated channel object:
Related Guides
Text
Wolfram Research (2017), ChannelReceiverFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/ChannelReceiverFunction.html (updated 2020).
CMS
Wolfram Language. 2017. "ChannelReceiverFunction." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/ChannelReceiverFunction.html.
APA
Wolfram Language. (2017). ChannelReceiverFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ChannelReceiverFunction.html
BibTeX
@misc{reference.wolfram_2025_channelreceiverfunction, author="Wolfram Research", title="{ChannelReceiverFunction}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/ChannelReceiverFunction.html}", note=[Accessed: 15-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_channelreceiverfunction, organization={Wolfram Research}, title={ChannelReceiverFunction}, year={2020}, url={https://reference.wolfram.com/language/ref/ChannelReceiverFunction.html}, note=[Accessed: 15-August-2025]}